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129 bytes added ,  08:41, 28 September 2017
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= Introduction =
Ligatures are combinations of letters that use different glyph shapes to avoid clashing of parts like i-dots and f-arcs. Many fonts contain at least fi and fl ligatures, well-furnished fonts have also ft, ffl, ffi, fft, fb, ffb, fh , ffh and maybe some traditional ones like st, sp, ct, ch and combinations with long s – German ß was originally a long-s + end-s ligature (even if it looks like s+z and is called szlig).
While the use of ligatures is a feature of good typography, there are places where they don’t belong, namely at syllable seams where hyphenation can or should take place.
Some typical German examples are Auf-lage, auf-laden, auf-fallen, Zupf-instrument, Schiff-fahrt. English examples would be chief-ly, shelf-ful, elf-like, wolf-trap, clothes-pin.
= Traditional TeX methods to break ligatures =
* Auf\/lage – breaks the ligature, but also kills hyphenation and kerning
* Auf{}lage – worked in pdfTeX (MkII), but not in modern TeX engines
* For LaTeX, there’s the [https://www.ctan.org/pkg/selnolig selnolig] package(English and German).
= Enabling Ligatures in fonts =

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